Just got my pi today but after I set it up it seems to work properly

Ethernet port is lit
Green light is flashing randomly
Red light is static

But no HDMI output from my monitor!

  • My pendrive is glowing when I connect it! Mar 14, 2016 at 14:26
  • Are you using an HDMI monitor or some kind of adapter cable to a non-HDMI monitor?
    – goldilocks
    Mar 14, 2016 at 14:43
  • Using a hdmi full HD monitor Mar 14, 2016 at 14:51

1 Answer 1


As long as by "Green light is flashing randomly" you do not mean in a steady, repeated pattern, then it is working.

Put the card in another computer, edit config.txt on the first partition (on windows or OSX this may appear to be the only partition) and add:


If that works, you can try reducing the subset of things it includes explained here, since the resolution this way will be low. For example, it may be that all you actually need is


Although this seems a little counter-intuitive, since you aren't actually hotplugging. It may also be that you need to experiment with hdmi_group and hdmi_mode settings further down the same page. Or it may be the boost or ignore_edid settings, all of which are, again, included with hdmi_safe.

  • I don't that actually Mar 14, 2016 at 14:53
  • If you mean you tried that and it did not work, it is possible the HDMI jack is busted -- try another cable and another TV/monitor if possible. If the random green flashing never stops, or at least does not slow down a lot after a few minutes, then that is indicative of some other kind of problem, you may want to try re-burning the SD card.
    – goldilocks
    Mar 14, 2016 at 14:57
  • I'll try it on my TV and inform you! Mar 14, 2016 at 14:59
  • It's working now! Mar 14, 2016 at 15:49
  • RPi 3B v1.2. hdmi_safe=1 worked fine with the latest rasperian.
    – mszmurlo
    Jul 23, 2018 at 16:51

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